<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    #app{
        width: 100px;
        height: 100px;
        border: 1px solid #333;
    }
</style>
<body>
    <div id="app" draggable="true">
        可拖拽
    </div>
    <script>
        //单位时间以内只触发一次  如果在这个单位时间之内多次触发，最终只会执行一次
        let timer = null;
        const app = document.getElementById("app");
        app.addEventListener("drag",function(e){
            if(timer){
                return
            }else{
                timer = setTimeout(() => {
                    console.log(e.offsetX,e.offsetY);
                    timer = null;
                }, 500);
            }
        })
    </script>
</body>
</html>